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Fig. 2

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From bottom to top: Qabs values for forsterite (dashed grey, Sogawa et al. 2006), aerosol measurements of forsterite (green, Tamanai et al. 2006), Mg-rich (blue), Fe-rich olivine grains (red, Tamanai & Mutschke 2010) and stellar-subtracted spectrum of HD 69830 in arbitrary units (black). The Qabs values and spectrum were scaled and offset for clarity.

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